Device for holding flexible sensitive sheets.



PAIENTED 00T. 13, 190s.A

No. 741,445, l

E. EEGIIMANN. DEVICE EOE HOLDING FLEXIBLE SENSITIVE SHEETS.

APPLICATION FILED JAN, 28, 1903.

2 SHEETS-SHBET 1.

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R. BECKMANN. DEVICE FOR HOLDING FLEXIBLE SENSITIVE SHEETS.

y AYPLICATION FILED JAN. 28, 1903. j

N0 MODEL.

Z SHEET-SHEET 2. 1./ /wy UNITED STATES Patented October 13, 1903.

PATENT EEICE.

DEVICE FOR HOLENG FL BLE SNSlTlVE SHEETS.

SPECIFICATION forming part of Letters Patent No. 741,445, dated October 13, 1903.

Application filed January 28, 1903. Serial No.14059. (No model.)

To all whom it may concern:

Be it known that l, RICHARD BEGKMANN, a subject of the German Emperor, and a resident of Charlottenburg, Germany, have invented a new and Improved Device for Holding Flexible Sensitive Sheets, of which the following is a full, clear, and exact description.

The invention relates to photographic-plate holders; and its object is to provide a new andimproved device more especiallydesigned to permit the use offlexible sensitive paper sheets, films, and the like in a camera in place of the ordinary dry-plates and to allow the photographer to readily manipulate Jthe device and the sensitive sheet removably carried by it during the process of filling the camera, exposing, developing, fixing, washing, and drying to form the photograph, and to allow quick removal of the finished photograph and replacing it by another sensitive sheet.

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a face view of a modified form of the improvement. Fig. 2 is an enlarged sectional side elevation of the same on the line 6 6 of Figi. Fig. 3 is an enlarged face View of one end of the improvement shown in Fig. 1, the clamping or locking member being in an open position. Fig. 4 is an edge View of the same, and Fig. 5 is a side elevation of the same. Fig. 6 is a face view of another modified form of the improvement in its open position, eccentrically-arranged side bars being used for holding the sensitive sheet. Fig. 7 is an elevation of the same. Fig. 8 is a section of the same on the line 12 12 of Fig. 6. Fig. 9 is a plan view of the same, showing the locking members in their clamping position. Fig. 10 is an elevation of the same. Figs. 11 to 13 are detail views of the same, drawn on an enlarged scale.

Figs. l-l and 15 represent parts shown in Figs. l1 and 12, but arranged in a somewhat different way.

By the arrangement shown in Figs. 1, 2, 3, 4, and 5 provision is made for stretching the sheet e taut in the frame l), and for this purpose one of the clamping members d is dispensed with and is replaced by a shaft o', journaled in suitable bearings in the sides of the frame l), and one outer end of the shaftz' is provided with a polygonal offset p for applying a wrench, key, or like tool for turning the shaft fi. in its bearings. The shaft /L is provided with a clamping member m,hinged at one end at 7c to the shaft, and between this clamping member and the shaft is clamped one end of the sheet c, the other end of which is held between the corresponding end of the frame l), clamping member d, and pins g. A sleeve n, slidable on the shaft i, is adapted to engage the free end of the clamping member m to lock the latter in position on the shaft i, with the end of the sheet clamped between the said member m and the shaft. The operator now turning the shaft draws the sheet e taut in the frame b.

The shaft 7l is held against turning motion by a ratchet-wheel q, secured on the shaft z' and engaged by a spring-pawl r, secured to the frame, as plainly shown in Figs. 1, 3, and 5. The shaft t' may be provided with pins g, adapted to pass into openings h in the clamping member m, the same as the pins g engage the openings hin the clamping member d.

ln the construction shown in Figs. (i to 13 the device is composed of a sheet or frame l), two opposite edges a of which are turned over to form a channel for receiving the sensitive sheet e to be secured. Between the edge a and the portion of the frame lying underneath there is arranged at both of the sides of the frame a half-cylindrical bar a', which at one end. is mounted in the upturned longitudinal edge f z/ of the frame and is provided at its other bent end with a notch w, engaging with the side of the turned-over edge a, as shown in Figs. S and 13. The bent front ends of the bars form handles o.

.After insertion of a sensitive sheet of paper c into the frame a the two bars are turned inward in opposite directions,as shown by the arrows in Fig. 17, and brought into the position shown in Figs. 9, lO, and 12. In this movement they first grip the paper c along its edges lying between the turned edges Ct and the frame h and finally exert an eccentric -like action upon the two paper edges, whereby the sheet is drawn taut and stretched toward the two opposite edges of the frame and securely held.

In the modification shown in Figs. 6 to 13 the bars e are so mounted that one-quarter of a turn is required for closing. If it be desired to give a greater stretch to the sheet e by the turning of the bars e', the lattcr may be arranged so as to require a half-revolution for moving them from their open position into the closed position. This modification is illustrated in its two extreme positions in Figs. 14 and 15.

It will be easily understood that instead of eccentric bars a cams or other equivalent means might be used without departing from the spirit of the invention.

I do not limit myself to the particular description of clamping devices employed, as the same may be varied without deviating from the spirit of my invention, it being, however, understood that the clamping members serve to removably hold the sheet in position in the frame and to allow of stretching the same taut when necessary.

In cameras using the ordinary platel1old ers, the device, with the sensitive sheet fastened therein,is simply inserted in the plateholder the same as the ordinary sensitive plate; butin magazine-cameras and the like, in which the sensitive plates are arranged one behind the other, it is necessary to cover the back of the frame with an opaque sheet to prevent the rays of light from passing through the sensitive sheet of the first device under exposure at the time to the sensitive sheet in the second device lying immediately behind the first device. This cover is removably fastened to the frame and is removed previous to the developing of the exposed sheet.

The device described is not to be confounded with the holders now employed for receiving a piece of an exposed roll film of a magazine-camera to allow convenient developing of the said piece or sheet.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A device for holding flexible sensitive sheets for producing photographs, consisting of a frame having clamping members at opposite sides for engaging the edges of the sheet, said clamping members being revolubly arranged in the frame, as set forth.

2. A device for holding flexible sensitive sheets for producing photographs, consisting of a frame having clamping members at opposite sides for engaging the edges of the sheet, said clamping members being revolubly and eccentrically arranged in the frame, as set forth.

3. A device for holding flexible sensitive sheets for producing photographs, consisting of a frame having clamping members at 0pposite sides for engaging the edges of thc sheet, said clamping members being revolubly and eccentrically arranged in the frame and being provided with handles, as set forth.

4. A device for holding flexible sensitive sheets for producing photographs, consisting of a frame having clamping members at opposite sides for engaging the edges of the sheet, said clamping members being revolubly and eccentrically arranged between opposite turned-over edges of the frame and the portions of the frame lying underneath, as set forth.

5. A device for holding flexible sensitive sheets for producing photographs, consisting of a frame having clamping members at opposite sides for engaging the edges of the sheet, said clamping members being revolubly and eccentrically arranged between opposite turned-over edges of the frame and the portions of the frame lying underneath, the side of said turned over edges engaging notches at the bent ends of the revolublc clamping members, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

RICHARD BEGKMANN. litnesses:

HENRY HAsPER, WOLDEMAR -I-IAUr'r. 

